model 123h temperature/humidity chamber operation and ......testequity 123hs temperature/humidity...

Copyright © 2015-2017 TestEquity LLC Rev. 2.1 – September 19, 2017

Model 123HS

Temperature/Humidity Chamber

Operation and Service Manual TestEquity LLC 6100 Condor Drive Moorpark, CA 93021 Support: 877-512-3457 Toll Free 805-480-0638 Corporate: 800-732-3457 805-498-9933 http://www.testequity.com

Table of Contents

Chapter 1 – Safety Instructions ________________________________________________ 1-1 Introduction ____________________________________________________________________ 1-1 Installation Safety Notices _________________________________________________________ 1-1 Operation Safety Notices __________________________________________________________ 1-2

Chapter 2 – Installation ______________________________________________________ 2-1 Uncrating _______________________________________________________________________ 2-1 Preparation For Use ______________________________________________________________ 2-1 Installation Location _____________________________________________________________ 2-2 Humidity Water Connection _______________________________________________________ 2-3

Plumbed Demineralized Water Installation __________________________________________________ 2-3 Water Recirculation System Installation, Model W100 _________________________________________ 2-3 Water Recirculation System Filter Cartridge Replacement ______________________________________ 2-3 Water Recirculation System Assembly, Model W100 __________________________________________ 2-4

Chapter 3 – Operation _______________________________________________________ 3-1 Introduction ____________________________________________________________________ 3-1 Summary of Chamber Operation ___________________________________________________ 3-1 Front Panel Switches and Lights ____________________________________________________ 3-2

POWER Switch________________________________________________________________________ 3-2 Loading the Chamber ____________________________________________________________ 3-4

Performance Considerations ______________________________________________________________ 3-4 Port Plugs ____________________________________________________________________________ 3-5 Avoiding Moisture (non-humidity mode) ____________________________________________________ 3-5 Internal Test Fixtures ___________________________________________________________________ 3-5

Humidity Operation ______________________________________________________________ 3-6 Humidity Mode Enable __________________________________________________________________ 3-6 Standard Humidity Range ________________________________________________________________ 3-6 Humidity Mode Considerations ___________________________________________________________ 3-6

Purge (optional) _________________________________________________________________ 3-7 GN2 (Gaseous Nitrogen) Installation (Option TE-1239) ________________________________________ 3-7 Dry Air Installation (Option TE-0017) ______________________________________________________ 3-7 Purge Operation _______________________________________________________________________ 3-8 Adjusting the Purge Flow ________________________________________________________________ 3-8 Relief Vent ___________________________________________________________________________ 3-8

Event Outputs ___________________________________________________________________ 3-9 Event Assembly (Option TE-1235)_________________________________________________________ 3-9

Chapter 4 - Limit Controller __________________________________________________ 4-1 Introduction ____________________________________________________________________ 4-1

Limit Controller Keys and Displays ________________________________________________________ 4-2 How to Set the High and Low Temperature Safety Limits _______________________________________ 4-2 Resetting an Out of Limit Condition ________________________________________________________ 4-2 Silencing the Audible Alarm ______________________________________________________________ 4-2 Protecting an Energized Test Sample _______________________________________________________ 4-3

Chapter 5 – Frequently Asked Questions ________________________________________ 5-1

Chapter 6 – Specifications ____________________________________________________ 6-1

Chapter 7 – Maintenance _____________________________________________________ 7-1 Preventive Maintenance Intervals __________________________________________________ 7-1

Daily or As Needed _____________________________________________________________________ 7-1 Every 3 Months ________________________________________________________________________ 7-1 Every 6 Months ________________________________________________________________________ 7-1 Every 12 Months _______________________________________________________________________ 7-1

Table of Contents

Maintenance Procedures __________________________________________________________ 7-2 How to Clean the Chamber Interior and Exterior ______________________________________________ 7-2 How to Listen for Abnormal Noise or Vibration ______________________________________________ 7-2 How to Inspect the Door Seal _____________________________________________________________ 7-2 How to Inspect the Refrigeration Machinery Compartment ______________________________________ 7-3 How to Verify the Performance (Non-controlled humidity mode) _________________________________ 7-4 How to Verify the Performance (Controlled humidity mode) ____________________________________ 7-5 How to Inspect the Electrical Compartment __________________________________________________ 7-6 How to Clean the Condenser ______________________________________________________________ 7-6 How to Drain the W100 Water Recirculation System Reservoir __________________________________ 7-6 How to Drain the Humidity System ________________________________________________________ 7-7 How to Verify the Temperature Calibration __________________________________________________ 7-8 How to Verify the Humidity Calibration ____________________________________________________ 7-9 Humidity Sensor Calibration and Maintenance _______________________________________________ 7-9

Theory of Operation _____________________________________________________________ 7-10 Overview ____________________________________________________________________________ 7-10 Air Heating System ____________________________________________________________________ 7-10 Humidity System______________________________________________________________________ 7-10 Refrigeration System ___________________________________________________________________ 7-10 Troubleshooting ______________________________________________________________________ 7-11

Refrigeration System Charging Instructions _________________________________________ 7-13 Refrigerant Charge ____________________________________________________________________ 7-13

Recommended Spare Parts _______________________________________________________ 7-14 Major Electrical Parts ___________________________________________________________ 7-15 Major Refrigeration Parts ________________________________________________________ 7-16 General Parts __________________________________________________________________ 7-16 EZ-Zone Limit Controller Setup Parameters ________________________________________ 7-17

Setup Menu __________________________________________________________________________ 7-17 Operations Menu ______________________________________________________________________ 7-17

Chapter 8 - Warranty ________________________________________________________ 8-1

Chapter 9 – Drawings ________________________________________________________ 9-1

Chapter 1 – Safety

TestEquity 123HS Temperature/Humidity Chamber Page 1-1

Chapter 1 – Safety Instructions Introduction Follow all CAUTION notices to prevent damage to the chamber or your test sample. Failure to follow all CAUTION notices may void your warranty. CAUTION may also indicate a potentially hazardous situation which, if not avoided, may result in minor or moderate personal injury. WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. The safety alert symbol ! precedes a general CAUTION or WARNING statement. The electrical hazard symbol 2 precedes an electric shock hazard CAUTION or WARNING statement. Installation Safety Notices 2 WARNING: The power cord is equipped with a NEMA 5-20P grounded/polarized plug. To

prevent a shock hazard, DO NOT defeat the ground or polarization feature. This device MUST be plugged DIRECTLY into a properly grounded and polarized NEMA 5-20R receptacle. Due to high current demand on start-up, use of an extension cord is NOT recommended.

! CAUTION: The minimum clearance you should allow for proper ventilation around the

chamber must be at least 6" from both the left and right side, and 12" from the rear.

! CAUTION: This chamber is designed for operation in a conditioned laboratory

environment. Operation above 30°C (85°F) or below 16°C (60°F) ambient room temperature is NOT recommended.

Chapter 1 – Safety

Page 1-2 TestEquity 123HS Temperature/Humidity Chamber

Operation Safety Notices ! CAUTION: The F4/F4T Controller alarms are configured for internal protection of the

humidity system. Do NOT change this configuration under any circumstances. The independent EZ-Zone Limit Controller functions as the main system and product protection device.

! CAUTION: The EZ-Zone Limit Controller has been properly configured by TestEquity to

match the chamber’s system requirements. Improper modifications to these setup values can result in unreliable and unsafe operation. Do not attempt to modify the setup values, unless you thoroughly understand what you are doing. The correct values are documented in the “EZ-Zone Limit Controller Setup Parameters” section of this manual.

! CAUTION: Always verify that the Limit Controller’s high and low limits are set to

temperatures that are appropriate for your test sample. ! CAUTION: If your test sample is energized, it may be capable of raising the workspace

temperature beyond safe limits. This could occur if your test sample exceeds the live load rating of the chamber or if the chamber’s refrigeration system fails. This chamber has a set of contacts that can be used to remove power to your test sample if the Limit Controller’s temperature limits are exceeded.

! CAUTION: To prevent damage to your test sample and the chamber’s compressors, do not

exceed the live load rating of the chamber. ! WARNING: Do NOT put items in the chamber that could burn or explode at high

temperatures. This chamber uses open wire heating elements which generate surface temperatures over 1000ºF. This is NOT an explosion-proof chamber.

! WARNING: Do NOT put items in the chamber which can emit corrosive vapors or

substances. ! WARNING: This chamber is NOT a curing oven. There are NO provisions for venting

fumes. ! WARNING: The chamber door must remain closed while the chamber is operating. If you

need to open the door while the chamber is operating, wear safety goggles to prevent the high velocity airflow from blowing particles or objects into your eyes.

! WARNING: This chamber operates at extreme temperatures. Avoid contact with air,

objects, and surfaces that are hot or cold to prevent severe burns or frostbite. Protective gloves are recommended.

Chapter 2 – Installation


Chapter 2 – Installation Uncrating Inspect the shipping container for any signs of visible damage. Notify the carrier and TestEquity immediately if there are signs of shipping damage. The pallet is designed with ramps so the chamber can be rolled off without the need for a forklift or pallet jack. 1. Cut the two metal bands that hold the packaging to the pallet. 2. Remove the top cover. 3. Remove the plastic fasteners that hold the outer box together and remove the outer box. 4. Locate the retainer in the front of the pallet. Remove the two screws, then remove the

retainer. Keep in mind that there is also Velcro that holds the retainer in place. Place the retainer in the front of the pallet on the floor.

5. Locate the two ramps under the chamber and remove them. 6. Attach the ramps to the front of the pallet using the Velcro straps. The retainer will be under

the ramps and act as a support. 7. Carefully roll the chamber off the pallet, onto the ramps. This should be done with at least

two people. Preparation For Use 1. Inspect the chamber for signs of shipping damage. 2. Read this entire manual. 3. Select a suitable location to install the chamber. 4. Connect to the power source. 5. Perform following the procedures as described in the Preventive Maintenance section:

a. Inspect the electrical compartment. b. Inspect the refrigeration machinery compartment. e. Verify the chamber performance.



Installation Location The chamber will produce a significant amount of heat during normal operation. Locate the chamber in a room with adequate ventilation to prevent excessive heat build-up. The chamber generates a heat load of up to 5,000 btuh during a continuous cool down from a high temperature. The chamber must be on a solid and level floor. Allow enough space around the chamber to permit serviceability and the removal of the service access panels, which are located on each side and the rear. ! CAUTION: The minimum clearance you should allow for proper ventilation around the

chamber must be at least 6" from both the left and right side, and 12" from the rear.

! CAUTION: This chamber is designed for operation in a conditioned laboratory

environment. Operation above 30°C (85°F) or below 16°C (60°F) ambient room temperature is NOT recommended.



Humidity Water Connection 2 CAUTION: The humidity system must be supplied with demineralized water having a

specific resistance of 50,000 to 200,000 ohms/centimeter. The use of unfiltered tap water or triple-distilled water will damage the humidity system and chamber interior, and will void the warranty.

Plumbed Demineralized Water Installation Follow these instructions if your chamber is NOT being used with the optional water recirculation system, and you are connecting to a plumbed source of demineralized water. 1. Attach a supply of demineralized water to the Water Supply fitting on the chamber. Water

pressure must not exceed 50 psi. 2. The chamber drain water is not under pressure, and is fed by gravity. Therefore, it must

empty into an open floor drain, condensate pump, or bucket. Water Recirculation System Installation, Model W100 The optional Model W100 Water Recirculation System provides a source of demineralized water for the humidity system, using ordinary tap water. Condensate from the chamber is returned back to the water tank. The water pump runs continuously when the humidity system is enabled, keeping the supply line pressurized at all times. Detailed assembly pictures are shown on the next page. 1. Attach filter cartridge. Use clamp provided on each end of filter to prevent leaking. Do not

overtighten. 2. Position the recirculation system on the back left side of the chamber. 3. Attach the chamber Water Supply hose from the chamber to the top fitting of the filter. Use

clamp provided to secure the hose to the Water Supply fitting. 4. Attach the chamber Drain hose to the chamber and position it so it goes into the water tank.

The drain hose must not be submerged in the water. 5. Fill the water tank with clean water. 6. Place the cover on the water tank. 7. Plug the pump power supply into the receptacle labeled Pump on the rear of the chamber.

Water Recirculation System Filter Cartridge Replacement The demineralizer filter cartridge must be replaced when it is used up. The color of the top half of the cartridge changes gradually through continued use. Replacement cartridges are available from TestEquity (part number TE-0014 for a carton of 6 cartridges).



Water Recirculation System Assembly, Model W100

Finger-tighten the Water Supply and Drain connections to chamber. Plug the pump power supply into receptacle on the back of the chamber. The drain tube from the chamber must not be submerged in the water.

Bottom of Filter Top of Filter

Clamp

Clamp

Reservoir drain. Drain water when it appears dirty.

Replace filter when white portion turns brown up to this point.

Clamp

NOTE: The rear panel of your chamber may look different.

Chapter 3 – Operation


Chapter 3 – Operation Introduction The Front Panel Switches control power to the chamber. The Front Panel Lights provide indication of heat and cool functions. The EZ-Zone Limit Controller is a protection device. It turns the chamber OFF if the workspace temperature exceeds either a high temperature or low temperature limit set point. The F4/F4T Controller controls the temperature and humidity of the chamber. It can function as either a single set point controller or as a programmable profile controller. The F4/F4T Controller automatically turns the refrigeration system on or off based on the demand for cooling. Refer to the separate F4 or F4T Temperature/Humidity Controller manual for details on how to use the Controller. Summary of Chamber Operation 1. Turn the Power Switch ON. 2. Enter the appropriate high and low temperature safety limits on the Limit Controller. 3. Enter the desired set points (or program) on the F4/F4T Controller. 4. Load your test sample in the chamber. 5. If you are running a controlled humidity condition between +10°C and +85°C, turn Event 2

on the F4 controller or the Humidity button on the F4T controller ON. 6. If you are running temperature-only conditions or are operating lower than +10°C or higher

than +85°C, turn Event 2 on the F4 controller or the Humidity button on the F4T controller OFF. Humidity cannot be controlled in this range of temperature.

7. Turn the CONDITIONING Switch ON. Alternatively, turn the CONDITIONING Switch to the EVENT 1 position and turn EVENT 1 on the F4 controller or the Power button on the F4T controller ON.



Front Panel Switches and Lights POWER Switch The POWER Switch controls power to the entire chamber. The POWER Switch illuminates when it is ON. CONDITIONING Switch – ON Mode The CONDITIONING Switch enables all chamber functions. When the CONDITIONING Switch is OFF, only the Temperature Controller and Limit Controller are operational. When the CONDITIONING Switch is ON, the chamber’s temperature conditioning system will function to maintain the temperature set point. The CONDITIONING Switch does NOT illuminate in any position. CONDITIONING Switch – EVENT 1 Mode When the CONDITIONING Switch is in the EVENT 1 position, you can enable and disable all chamber functions through Event 1 (Digital Output 1) of the F4 Controller or the Power button on the F4T Controller. LIGHT Switch The LIGHT Switch controls the workspace light. The LIGHT Switch illuminates when it is ON. HEAT Light The HEAT Light will illuminate when the Temperature Controller turns on the heater to maintain the workspace temperature. The HEAT Light will cycle on/off as the workspace temperature approaches and reaches the temperature set point. COOL Light The COOL Light will illuminate when the Temperature Controller turns on the cooling valve to maintain the workspace temperature. The COOL Light will cycle on/off as the workspace temperature approaches and reaches the temperature set point. HUMIDITY ENABLE Light The Humidity mode is enabled through Event 2 on the F4 Controller or the Humidity button on the F4T Controller. This should only be ON if you are performing a controlled humidity test within the humidity range of the chamber (+10°C and +85°C). The HUMIDITY ENABLE light will be illuminated, as long as the chamber temperature is within +7°C and +90°C. The chamber will cool in single-stage refrigeration mode. If the Humidity mode is disabled, the chamber will cool in cascade refrigeration mode and there will be no humidity control.



HUMIDITY Light The HUMIDITY Light will illuminate when the F4/F4T Controller turns on the humidifier heater to maintain the workspace humidity. The HUMIDITY Light will cycle on/off as the workspace humidity approaches and reaches the humidity set point.

Note that the HUMIDITY ENABLE must be ON, the chamber workspace must be between +7°C and +90°C, and the humidifier water level must be correct for the HUMIDITY Light to correspond to the humidity output on the F4/F4T controller. There is no corresponding light on the front panel for the dehumidification function.



Loading the Chamber ! WARNING: Do NOT put items in the chamber that could burn or explode at high

temperatures. This chamber uses open wire heating elements which generate surface temperatures over 1000ºF. This is NOT an explosion-proof chamber.

! WARNING: Do NOT put items in the chamber which can emit corrosive vapors or

substances. ! WARNING: This chamber is NOT a curing oven. There are NO provisions for venting

fumes. ! WARNING: The chamber door must remain closed while the chamber is operating. If you

need to open the door while the chamber is operating, wear safety goggles to prevent the high velocity airflow from blowing particles or objects into your eyes.

! WARNING: This chamber operates at extreme temperatures. Avoid contact with air,

objects, and surfaces that are hot or cold to prevent severe burns or frostbite. Protective gloves are recommended.

! CAUTION: If your test sample is energized, it may be capable of raising the workspace


! CAUTION: To prevent damage to your test sample and the chamber’s compressors, do not

exceed the live load rating of the chamber. Live Load Capacity for Model 123HS (uncontrolled humidity mode only) Temp +23°C 0°C –40°C –55°C –65°C Watts 500 W 400 W 225 W 175 W 100 W

Performance Considerations The performance of all chambers is significantly affected by the characteristics of your test sample. Factors include size, weight, material, shape, and power dissipation if energized. The test sample should be placed in the chamber in a manner that allows for air circulation. The air plenum is located on the back wall of the chamber, where air is sucked in from the bottom and exits from the top. You should not place the test sample directly on the chamber floor. It should be placed on the shelf. Multiple test samples should be distributed throughout the chamber to ensure even airflow and minimize temperature gradients. If necessary, additional shelves should be used to evenly distribute the load. Verify that the temperature gradients are within acceptable limits, by measuring the chamber temperature at strategic points using a multipoint thermocouple meter or data logger.



You may find that the temperature throughout the chamber is even, but always different from what the F4/F4T Controller indicates. The correct way to adjust what the F4/F4T Controller “displays” compared to what is measured at some point other than the controller’s sensor is with the “Calibration Offset” parameter, NOT by recalibrating the controller. Port Plugs Foam port plugs are provided with a gray silicone surface on one side. The port plug must be inserted with the gray silicone surface facing the inside of the chamber. Port plugs should be considered expendable and be replaced when they no longer provide a good seal. Avoiding Moisture (non-humidity mode) Any time the ambient air is subjected to temperatures below the dew point, moisture will condense out of the air. The effect is ice or frost during low temperature operation, or water when maintaining over 0°C and cooling is required. To avoid moisture condensation, make sure the port plugs are inserted at all times. Also, avoid opening the chamber door while the chamber is operating at temperatures below room ambient. When a low temperature test is completed, warm the chamber to at least room ambient before opening the chamber door and before removing your test sample. You CANNOT use the humidity system to control moisture at low temperatures. The humidity system is disabled below +7°C. However, if you have a source of GN2 (gaseous nitrogen) or Dry Air, you can use the Purge system to eliminate moisture condensation at low temperatures. Internal Test Fixtures Some applications require internal fixtures to support test samples and provide a convenient method of connecting wires and sensors. Fixtures must be designed to minimize their impact on chamber functionality and performance. Fixtures should be designed for easy removal to permit maintenance and cleaning of the chamber. The chamber liner should never be drilled or screwed into. This will compromise the integrity of the liner and permit moisture migration due to condensation into the insulation, which will eventually impact performance and lead to premature rusting of the outer cabinet. Fixtures should be constructed of stainless steel. This also applies to all screws and fasteners. All welds should be passivated. To prevent rust and corrosion, never use iron or mild steel even if it is painted or plated. Aluminum may be used. However, since the specific heat of aluminum is double that of steel, it represents a greater load and will have more impact on the chamber performance. Make sure that all connectors, wiring, pc boards, and auxiliary components can withstand the temperature extremes that they will be subjected to. In some cases, these components may not be able to last after repeated tests and should be considered expendable.



Humidity Operation Humidity Mode Enable The Humidity mode is enabled through Event 2 on the F4 Controller or the Humidity button on the F4T Controller. This mode should only be ON if you are performing a controlled humidity test within the temperature humidity range of the chamber as shown in the chart below. Standard Humidity Range This chamber is capable of controlling humidity from 10% RH to 95% RH over the temperature range of +10°C to +85°C. The lowest possible humidity in the Standard Range varies depending on the temperature, and is limited to a 6°C dew point. For example, +45°C is the lowest temperature that 10% RH can be achieved. Below is a chart that shows the achievable range of humidity as compared to temperature. Achieving low humidity levels require you to start with a clean, dry chamber. For extended low humidity range below 6°C a dew point condition, see “Purge Option” which follows. The F4/F4T will automatically disable the humidity system below +7°C and above +90°C to protect the chamber.

Figure 3-1 – Achievable Range of Temperature/Humidity Conditions Humidity Mode Considerations The chamber workspace must be between +7°C and +90°C. If the chamber is outside this temperature range, the chamber will operate as though the Humidity Enable was OFF. It takes several minutes for the humidifier to fill to the correct level after the water supply is initially connected to an empty system. The humidifier function is disabled until the water level is correct. If you are running a high humidity condition, it can take approximately 5 minutes until the humidifier heats up from an initial “cold start”. During most of that time, it might appear that “nothing is happening” because there is little increase in the humidity reading. Be patient – if the Humidity Light is ON, the humidity will eventually begin to rise after this initial heat-up period.



Purge (optional) Optional GN2 (gaseous nitrogen) Purge or optional Dry Air Purge can be used to reduce to possibility of condensation in the chamber at low temperatures, or to achieve humidity control below a 6°C dew-point condition. ! CAUTION: Nitrogen cannot be detected by human senses. Nitrogen is non-toxic.

However, if adequate ventilation is not provided, nitrogen will displace air. This can cause dizziness, unconsciousness or death without warning. The chamber must be located in a well-ventilated area. Do not open the chamber door with the GN2 flowing.

GN2 (Gaseous Nitrogen) Installation (Option TE-1239) Connect a supply of GN2 with a maximum pressure of 100 psig to the 1/4-inch FPT fitting which is designated PURGE on the rear panel. Dry Air Installation (Option TE-0017) Connect the hose from the Dry Air system to the fitting which is designated PURGE on the rear panel. Connect a supply of compressed air to the 3/8-inch FPT shutoff valve of Dry Air system. This system requires a 5 cfm supply air flow rate at 100 psig (175 psig max).

Figure 4.4 – Dry Air Purge System Installation

Compressed Air Inlet to Dry Air System. Shutoff valve on the Dry Air System is shown in the off position. Valve must be in the on position to operate.

Purge Inlet from Dry Air System Connect to PURGE fitting on chamber.



Purge Operation The Purge mode is enabled through Event 3 (Digital Output 3) on the F4 Controller or the Purge button on the F4T Controller. For low humidity control • Turn Event 2 (HUMIDITY) ON and Event 3 (PURGE)ON. • Purge gas will feed when the F4/F4T Controller cycles the dehumidification system. It will

cycle on/off as the workspace humidity approaches and reaches the low humidity set point, or whenever dehumidification is necessary.

For low humidity control below +10°C Turn Event 2 (HUMIDITY) OFF and Event 3 (PURGE)ON. The Purge System will continue to provide controlled dehumidification even though the humidity system is disabled. Adjusting the Purge Flow A flowmeter is located on the front panel to adjust the flow of purge gas into the chamber. The flowmeter has a scale, calibrated in SCFM. The flow of purge gas should be adjusted to the minimum amount required to obtain the desired drying in the chamber for your particular conditions. A suggested starting setting is 2 SCFM. Relief Vent Excess pressure in the chamber workspace is vented through a pressure-relief check-valve, which is located on the top of the chamber.



Event Outputs The F4/F4T Controller has digital outputs which can be configured as Event Outputs to turn remote devices on and off. There are four Event Outputs which are available for customer use. Event Output 1 is dedicated for System Enable. Event Output 2 is dedicated for Humidity Enable. Event Output 3 is dedicated for Purge. The Event Outputs 4 through 7 are available for customer use. Event Assembly (Option TE-1235) The optional Event Assembly contains four solid state relays to control AC operated devices, such as power to a test sample. The solid state relays are rated for 24 to 240 VAC, 5.0 Amps. The event relays are just switches. You must provide power from an external source. Connecting to the Event Assembly 1. Unplug the chamber from the power source. 2. Remove the top cover. 3. Locate the Event Assembly and connect your wires to the desired solid state relay terminals. 4. A 1/2-inch conduit hole is provided on the back panel to route your wires through. Use the

appropriate wire/cable management fittings.

Figure 3-3 – Event Relay Location

Event Numbers 6 7

4 5

Chapter 4 – Limit Controller


Chapter 4 - Limit Controller Introduction The EZ-Zone Limit Controller is a protection device. It turns the chamber OFF if the workspace temperature exceeds either a high temperature or low temperature limit. You can set these limits to correspond to the maximum and minimum temperature that your test sample can safely withstand. This provides protection against someone setting the F4/F4T Controller to a temperature that is unsafe for the test sample. It also provides protection in the unlikely event of a chamber system component failure. The Limit Controller has its own temperature sensor (thermocouple) and functions completely independent of the F4/F4T Controller. This section provides a brief overview on how to operate the Limit Controller. For more detailed instructions, see the “EZ-Zone User’s Manual”. ! CAUTION: The “EZ-Zone User’s Manual” is a general manual and is written by the

manufacturer, Watlow, for a wide variety of applications and configurations. Not all features or functions are applicable. Only the capabilities of a model PM6L1AJ-AAAABAA are applicable.

! CAUTION: The EZ-Zone Limit Controller has been properly configured by TestEquity to

match the chamber’s system requirements. Improper modifications to these setup values can result in unreliable and unsafe operation. Do not attempt to modify the setup values, unless you thoroughly understand what you are doing. The correct values are documented in the “EZ-Zone Limit Controller Setup Parameters” section of this manual.

! CAUTION: Always verify that the Limit Controller’s high and low limits are set to

temperatures that are appropriate for your test sample. ! CAUTION: If your test sample is energized, it may be capable of raising the workspace




Limit Controller Keys and Displays

Figure 4-1 – Limit Controller Keys and Displays

How to Set the High and Low Temperature Safety Limits 1. Press the ‰ key once to get the [`LL;s] prompt in the lower display. This is the Low Limit

Set Point prompt. 2. Press the ▲or ▼ key to enter the desired Low Limit Set Point in the upper display. Make

sure it is lower than your actual chamber temperature set point, and at least below room temperature to prevent nuisance tripping.

3. Press the ‰ key once again to get the [`lh;s] prompt in the lower display. This is the High Limit Set Point prompt.

4. Press the ▲or ▼ key to enter the desired High Limit Set Point in the upper display. Make sure it is higher than your actual chamber temperature set point to prevent nuisance tripping.

5. Press the RESET Key to return to the Home Page. 6. The upper display will show the actual chamber temperature while the lower display will

show [SAFE] as long as the limits are not exceeded. Resetting an Out of Limit Condition If the limit is exceeded, the Limit Controller will flash [Li;h1] (high limit) or [Li;L1] (low limit) in the upper display and [Attn] in the lower display, alternating with the actual chamber temperature in the upper display and [FAiL] in the lower display. It will also shut down all chamber functions. The Limit Controller cannot be reset until the temperature returns to within the limit set points. Then, you must press the RESET or EZ Key to resume normal operation. Silencing the Audible Alarm Turning off the CONDITIONING switch on the chamber front panel lets you temporarily turn off the Audible Alarm, even though the High or Low Limit condition may still exist.



Protecting an Energized Test Sample If your test sample is energized, it may be capable of raising the workspace temperature beyond safe limits. This could occur if your test sample exceeds the live load rating of the chamber or if the chamber’s refrigeration system fails. This chamber has a set of safety contacts that can be used to remove power to your test sample if the Limit Controller’s temperature limits are exceeded. The safety contacts are rated as follows: Resistive: 10 A, 250 VAC or 10 A, 28 VDC. Inductive: 7 A, 250 VAC To access the safety contacts: 1. Unplug the chamber from the power source. 2. Remove the top cover. 3. Locate relay CR1 on the electrical sub panel as indicated below. Remove the retaining clip

and unplug the relay. Connections to the safety contacts are at relay CR1 socket, terminals 6 and 8. Plug in the relay and reposition the retaining clip when finished.

Figure 4-2 – Location of Safety Contact Connections on the Electrical Sub Panel

Chapter 5 – Frequently Asked Questions


Chapter 5 – Frequently Asked Questions I need to send the chamber outside North America. Will it work with their power? Outside North America, most countries have 50 Hz. Nominal voltages in are typically 220 V to 240 V. You CANNOT simply step the voltage down to 120 V because the compressors have a 50 Hz rating of 100 V nominal (95 V min. to 110 V max.). Why does my chamber heat or cool slower than the published specifications? Performance is significantly affected by the characteristics of your test sample. Factors include size, weight, material, shape, and power dissipation if energized. The test sample should be placed in the chamber in a manner that allows for air circulation. You should not place the test sample directly on the chamber floor. It should be placed on the shelf. Multiple test samples should be distributed throughout the chamber to ensure even airflow and minimize temperature gradients. If necessary, additional shelves should be used to evenly distribute the load. You can determine if the chamber is operating properly by following the procedure in “How to verify the chamber performance”. How can I modify the chamber to cool faster? Unfortunately, there is little you can do to improve upon the designed-in performance. TestEquity does NOT recommend using CO2 or LN2 in this chamber to achieve faster cooling due to reliability and safety considerations, so it is NOT an available option. Modifying the chamber to add CO2 or LN2 will void the warranty. Why is there water/ice/snow in the chamber? Any time the ambient air is subjected to temperatures below the dew point, moisture will condense out of the air. The effect is ice or frost during low temperature operation. When the chamber is heated above 0°C, the ice or frost will turn into water. To avoid moisture condensation, make sure the port plugs are inserted at all times. Also, avoid opening the chamber door while the chamber is operating at temperatures below room ambient. When a low temperature test is completed, warm the chamber to at least room ambient before opening the chamber door and before removing your test sample. My test specification requires convection heat only. Can I turn the circulator motor off? NO! This will damage the heating and refrigeration systems and void the warranty. You need a “gravity convection oven” for that kind of test.



How accurate is the chamber? That’s a loaded question! There is no “chamber accuracy” specification as such. The answer requires an understanding of several performance parameters. Control Tolerance – The F4/F4T Controller uses a thermocouple control sensor, which is located in the discharge airflow. Control tolerance is a measure of how much the temperature varies after stabilization at the control sensor. It is a measure of the relative variations, NOT the absolute accuracy of the readout. The control tolerance specification for this chamber is ±0.5°C, or a total of 1°C. For example, the temperature set point may be –25.0°C. The actual temperature varies between –25.4°C and –24.5°C. This corresponds to –0.4°C and +0.5°C or a total of 0.9°C of RELATIVE variations. These specifications are for an empty chamber. The addition of a test sample may affect the control variations. In some instances, the test sample will reduce these variations. Uniformity – Also known as Gradients. This is a measure of variations in temperature at different locations throughout the chamber interior, at the same time, after stabilization. The uniformity specification for this chamber is ±0.5°C or a total of 1°C, when measured at least 2" away from the chamber interior walls. These specifications are for an empty chamber. The addition of a test sample may affect the temperature uniformity. For example, an energized test sample will produce a higher temperature near the sample. Controller Accuracy – This is the ability of the F4/F4T Controller to accurately display a temperature measurement when compared to a standard. The controller display accuracy is ±1.66°C. However, the total measurement accuracy in the chamber includes the thermocouple sensor wire accuracy. Thermocouple wire accuracy is ±1°C or 0.75% of reading, whichever is greater. Therefore, total system accuracy over the chamber’s operating range can be as much as ±2.66°C, although the typical accuracy is often better than ±1.0°C. Can I tilt the chamber to move it? You should be able to tilt the chamber 45 degrees to move it. After tilting it and moving it into place, perform the steps as outlined in “How to inspect the refrigeration machinery compartment” and “How to check the refrigerant charge” before placing the chamber back into service to make sure that no damage has occurred. I’m not going to use the chamber for a while. Is there anything I should do to prepare it for storage? Perform ALL the steps in the Preventive Maintenance Schedule before placing the chamber into storage. This will ensure that the chamber will be ready to operate when it is taken out of storage. If the chamber has a problem and is still under warranty, these problems should be resolved before being placed into storage, since the warranty period starts from the date of shipment. The chamber should be stored in a conditioned environment. Do not store it outside or where it will be subjected to dirt or excessive moisture. I haven’t used the chamber for a while. Is there anything I should do to prepare it for operation? Perform ALL the steps in the Preventive Maintenance Schedule before placing the chamber back into service. This will ensure that nothing has been damaged and that a leak has not developed.



Can the person who services our air conditioning also service the chamber? Most air conditioning mechanics are not familiar with low-temperature cascade refrigeration systems. While this chamber is relatively easy to maintain and repair, most air conditioning mechanics do not have the necessary refrigerants and may not be familiar with the microprocessor-based controls. This chamber should only be serviced by a qualified mechanic that is familiar with environmental chambers. Call TestEquity to recommend one in your area, or to check if the one you would like to use is qualified. Can/Should I put a filter in front of the condenser air inlet? No, TestEquity does not recommend this. Just follow the maintenance procedures and clean the condenser fins periodically. How often should I charge the refrigeration system? This chamber uses a closed-loop refrigeration system. Just like your refrigerator at home, it does not need periodic charging. If the charge is low, this means that there is a leak. Leaks should be repaired before recharging. What kind of Freon does the chamber use? The word Freon® is a DuPont registered trade name for their CFC-based refrigerants and is incorrectly used as a generic term for refrigerants. TestEquity chambers do not use CFC-based refrigerants. The refrigeration system uses R-404A, which is also known as DuPont Suva® HP62.

Chapter 6 – Specifications


Chapter 6 – Specifications Temperature Range –35°C to +175°C Control Tolerance ±0.5°C (Short-term variations measured at the control sensor after stabilization) Uniformity ±1.0°C (Variations throughout the chamber after stabilization) Standard Humidity Range 10% to 95%, in the temperature range of 10°C to 85°C limited by a 6°C dewpoint; See chart on page 4-6. Control Tolerance ±3%RH (Short-term variations measured at the control sensor after stabilization) Live Load Capacity @ +23°C 0°C –10°C –20°C –30°C 500 W 400 W 300 W 200 W 100 W (Live load capacity is for non-humidity mode) Cool Down Transition Time* End Temp Start Temp to +23°C 0°C –10°C –20°C –30°C –35°C +23°C ---- 4 min 8 min 15 min 25 min ultimate +50°C 5 min 10 min 16 min 24 min 36 min ultimate +85°C 10 min 19 min 25 min 33 min 45 min ultimate +150°C 22 min 33 min 40 min 48 min 63 min ultimate Heat Up Transition Time* End Temp Start Temp to +23°C +50°C +85°C +125°C +150°C +175°C +23°C ----- 2 min 12 min 24 min 33 min ultimate 0°C 3 min 9 min 18 min 32 min 41 min ultimate –30°C 8 min 14 min 23 min 27 min 45 min ultimate *Note: Transition times are measured after a 2 hour soak at the respective start temperature with an empty chamber, as indicated on the temperature controller, 23°C ambient. Measured with setpoint beyond the start and end temperatures. Does not include the effect of proportional band when approaching setpoint. Input Power 120 V nominal (110 to 126 VAC), 60 Hz, 1 PH Max Current Draw 18 A, Recommended Minimum Service 20 A (dedicated line) Workspace Dimensions 18" W x 16.5" H x 13.5" D (2.3 cubic feet) Outside Dimensions 26" W x 63" H x 36.5" D (nominal). Vent tube adds 3" to height. Min. Installed Clearance 6" from the left and right side, 12" from the rear Access Ports 4" Port on left and right side (two total), Supplied with foam plugs Sound Level 58 dBA (A-weighted, measured 36" from the front) Weight 750 pounds NOTE: Performance is typical and based on operation at 23°C (73°F) ambient and nominal input voltage. Designed for use in a normal conditioned laboratory. Operation at higher ambient temperatures may result in decreased cooling performance. Additional ports and shelves will also affect performance. Operation above 30°C (85°F) or below 16°C (60°F) ambient is not recommended. Due to continuous product development, specifications are subject to change without notice.

Chapter 7 – Maintenance


Chapter 7 – Maintenance ! WARNING: Maintenance must be performed by properly trained personnel only. Preventive Maintenance Intervals Daily or As Needed • Clean chamber interior and exterior. • Listen for abnormal noise or vibration. • Inspect the demineralizer cartridge (if provided). Every 3 Months • Inspect the door seal. • Inspect the refrigeration machinery compartment. • Verify the chamber performance. • Drain the water recirculation system reservoir. Every 6 Months • Inspect the electrical compartment. • Clean the condenser. • Drain the humidity system. Every 12 Months • Verify the calibration.



Maintenance Procedures How to Clean the Chamber Interior and Exterior • Wipe or vacuum out all debris. • Clean surfaces with a damp cloth, mild detergent, or stainless-steel cleaner. Avoid cleaners

that are abrasive or leave a residue. Do NOT use steel wool. • If you clean the interior with something other than water, you may want to operate the

chamber at high temperature (approximately +125°C) after cleaning. This helps to “bake out” any residue. Remove the port plugs to permit the residual vapors to escape.

• Clean the silicone door gaskets with a damp cloth or mild detergent. • Clean the exterior painted surfaces with a damp cloth or mild detergent. If you are using a

detergent, test a small inconspicuous area to make sure it does not damage the finish. How to Listen for Abnormal Noise or Vibration You should become familiar with normal operating noises. Being able to recognize changes from normal operating noises can be a valuable way to identify problems and prevent further damage. Examples of noises to be aware of include: • Circulator motor and fan noises (with compressors off). • Compressor start-up and running noises, sequential starting of compressors. • Condenser fan noises. • Relay and valve cycling noises when cool light is cycling. How to Inspect the Door Seal The door has two silicone gaskets to minimize thermal losses and moisture migration. • Inspect the gaskets for dirt and tears. • Repair minor tears with a high quality RTV silicone such as GE RTV167. • Check the integrity of the door seal by closing the door on a sheet of paper. With the door

closed, slowly pull the paper. You should feel the resistance getting lighter as the paper goes past the inner gasket. Repeat this all around the door at several places.

• If the seal is not tight, adjust the door latch. The catch bracket that is mounted to the chamber has slotted holes to permit adjustment.

• If the seal is still loose on the hinge side, adjust the door hinge. The hinges have slotted holes to permit adjustment.



How to Inspect the Refrigeration Machinery Compartment ! WARNING: Wear safety goggles when inspecting the machinery compartment to protect

against a refrigerant line which could break. 1. Unplug the chamber from the power source. 2. Remove the side and rear panels. 3. Inspect for signs of water leaks. 4. Inspect for signs of refrigeration tubing abrasion. 5. Inspect for oil around refrigeration valves, fittings and joints. This may be a sign of leaks. 6. Inspect for loose hardware and tighten as required. 7. Inspect for signs of insect or rodent infestation. Yes, it does happen!



How to Verify the Performance (Non-controlled humidity mode) These tests verify the performance of the heating, cascade refrigeration mode, electrical controls, F4/F4T Controller, and air circulation systems. The chamber should meet all published performance specifications for non-controlled humidity conditions if all of these tests are successfully passed. These tests assume that the F4/F4T Controller’s setup and tuning values have not been changed from the values as shipped from TestEquity. Also, the EZ-Zone Limit Controller high limit must be set to over +85°C (+88°C would be fine), and the low limit set to –75°C. If the chamber fails any of these tests, it should be removed from service to prevent further damage until the cause of the problem is determined and resolved. 1. The chamber interior should be empty and at ambient temperature, approximately +23°C. 2. Turn ONLY the Power Switch ON. 3. Set the F4/F4T Controller temperature set point to +85°C. Event 2 (F4 Digital Output 2 or

F4T Humidity button) must be Off. Turn the Conditioning Switch ON. 4. The Heat Light should be ON continuously and the Cool and Humidity lights should be OFF. 5. The chamber should heat up to about +80°C and begin controlling (Heat Light cycles

ON/OFF) within 12 minutes. The chamber temperature should slowly increase and stabilize to +85°C. It should NOT overshoot beyond +85°C by more than a few tenths of a degree, and the compressors should NOT need to turn ON in order to maintain +85°C.

6. After stabilization, the chamber temperature should vary no more than ±0.2°C, or a total of 0.4°C.

7. Let the chamber stay at +85°C for two hours. 8. After two hours at +85°C, set the F4/F4T Controller temperature set point to –35°C. 9. The high-stage compressor should turn ON within a few seconds. Then, the low-stage

compressor should turn ON within approximately 30 seconds, the Cool Light should be ON continuously and the Heat Light should be OFF.

10. The chamber should cool down to about –30°C and begin controlling (Cool Light cycles ON/OFF) within approximately 45 minutes.

11. The chamber temperature should slowly decrease and stabilize to –35°C. It should NOT undershoot beyond –37°C, and the compressors should NOT need to turn OFF to maintain the temperature.

12. After stabilization, the chamber temperature should reach a nominal value of –35°C and vary no more than ±0.5°C, or a total of 1°C.

13. Set the F4/F4T Controller temperature set point to +23°C. The chamber should begin to heat up. The compressor should turn off within approximately 1 minute.

14. This concludes the chamber performance verification tests. 15. Let the chamber heat up to +23°C before turning the Conditioning Switch OFF.



How to Verify the Performance (Controlled humidity mode) These tests verify the performance of the heating, ambient-cooling refrigeration mode, humidification, electrical controls, F4/F4T Controller, and air circulation systems. The chamber should meet all published performance specifications for controlled humidity conditions if all of these tests are successfully passed. These tests assume that the F4/F4T Controller’s setup and tuning values have not been changed from the values as shipped from TestEquity. Also, the Limit Controller high limit must be set to over +85°C (+88°C would be fine). If the chamber fails any of these tests, it should be removed from service to prevent further damage until the cause of the problem is determined and resolved. 1. The chamber interior should be empty and at ambient temperature, approximately +23°C.

Water Inlet must be connected to a source of filtered water or the optional water recirculation system.

2. Set the F4/F4T Controller Set Point 1 to 85.0°C, and Set Point 2 to 85.0% RH. Event 2 (Digital Output 2) must be ON. Turn the Conditioning Switch ON.

3. The Heat Light and Humidity Mode Light should be ON continuously and the Cool light should be OFF. The Humidity Light should be ON continuously only after the humidifier fills up with water.

4. The chamber should heat up to about 80°C and begin controlling (Heat Light cycles ON/OFF) within 7 minutes.

5. The chamber temperature should slowly increase and stabilize to 85°C. It should NOT overshoot beyond 85°C by more than 1.0°C, and the compressor should NOT need to turn ON at this point in order to maintain 85°C.

6. The chamber humidity should begin to increase within approximately 5-10 minutes after the Humidity Light turns on. Then, the humidity should increase to 75% RH and the begin controlling (Humidity Light cycles ON/OFF)

7. After stabilization, the chamber temperature should be 85.0°C, ±0.5°C. The humidity should be 85.0%RH, ±0.5% on a short-term basis, with no more than a –3% RH dip on an occasional basis.

8. Next, change Set Point 1 to 50.0°C. Leave Set Point 2 at 85.0% RH 9. The compressor should turn ON (if it was not already ON), the Cool Light should be ON

continuously and the Heat Light should be OFF. The humidity will drop at this point. 10. The chamber should cool down to about 55°C and begin controlling (Cool Light cycles

ON/OFF) within a short time. 11. The chamber temperature should decrease and stabilize to 50°C. It should NOT undershoot

50°C by more than 2°C, and the compressors should NOT need to turn OFF in order to maintain 50°C. After stabilization, the chamber temperature should be 50.0°C ±0.5°C, or a total of 1°C. It may take approximately 45 minutes to stabilize at 85.0%, ±2.0%RH.

12. Next, change Set Point 2 to 50.0%RH. Leave Set Point 1 at 50.0°C. 13. The Humidity light will be OFF. The chamber humidity should go down to about 60%RH

fairly quickly. It may take approximately 15 additional minutes to stabilize at 50.0%, ±2.0%RH.

14. This concludes the controlled-humidity chamber performance verification tests.



How to Inspect the Electrical Compartment 1. Disconnect the chamber from the power source. 2. Remove the top cover. 3. Check for loose components, loose wires, burned insulation near terminals, and burned or

excessively pitted contacts on contactors. How to Clean the Condenser 1. Disconnect the chamber from the power source. 2. Remove the lower front panel. 3. Clean the condenser fins with a vacuum cleaner. NOTE: You may need to clean the condenser more frequently if the chamber is in a dusty environment. You may be able to clean the condenser less frequently if the chamber is in a very clean environment. How to Drain the W100 Water Recirculation System Reservoir 1. This procedure drains the water in the recirculation system only, not the vapor generator. 2. If the chamber is running a humidity test, turn it off. Otherwise, this task can be done while

the chamber is operational. 3. Place a basin capable of containing all the water in

the reservoir under the drain valve. Or, disconnect the Water Recirculation System and move it to an area where the water can be drained into a floor drain or outside.

4. Open the drain valve to empty the tank. 5. Refill the tank with tap water or filtered drinking

water (NOT spring water or distilled water). 6. Reconnect the Water Recirculation System if it

was disconnected. NOTE: You may need to drain and replace the water more frequently if the water appears dirty before the recommended maintenance interval of 3 months.

Figure 7-1 – Reservoir Drain Valve

Reservoir drain. Drain water when it appears dirty.



How to Drain the Humidity System 1. This procedure drains the water in the humidifier only, not the water recirculation system. 2. Wait at least 2 hours after running a humidity test before draining the system. 3. Disconnect the chamber from the power source. 4. Remove the lower rear panel. 5. Open the Drain Valve by turning its handle 90 degrees counter-clockwise (as if you were

facing the front of the valve handle). Water will come out of the Drain fitting on the back of the chamber.

6. After the system is drained, close the Drain Valve by turning its handle 90 degrees clockwise (as if you were facing the front of the valve handle).

Figure 7-2 – Humidity Drain Valve (shown in the closed, or normal operating position)

Humidifier. Warning – will be very hot during humidity system operation and can cause burns if touched!



How to Verify the Temperature Calibration ! CAUTION: TestEquity does not recommend performing the controller calibration

procedures unless you have verified that the controller is actually out of calibration.

TestEquity recommends verifying the calibration before attempting to actually perform a calibration. The state-of-the-art instrumentation used in TestEquity chambers is of the highest quality and seldom goes out of calibration. If you try to calibrate the instrumentation before determining that calibration is necessary, you may make it worse if done incorrectly. Variations in temperature throughout the chamber interior are NOT a measurement of controller accuracy. These variations, called “gradients”, are a function of the physical design of the chamber and its airflow, the characteristics of the test sample, and how it is oriented in the chamber. You cannot “calibrate” to improve gradients. The common practice of measuring multiple points in the chamber and adjusting the temperature controller’s calibration to correct for these errors is incorrect! The correct way to adjust what the temperature controller “displays” compared to what is measured at some point other than the controller’s sensor, is with the “Calibration Offset” parameter. The F4 or F4T Temperature/Humidity Controller User’s Manual for details. Calibration verification should be performed with the Calibration Offset set to 0.0 (zero). Total system accuracy in the chamber includes the controller plus the thermocouple wire accuracy. Total system accuracy over the chamber’s operating range is typically ±1.55°C, ±1 LSD or a theoretical total of ±2.55°C. The easiest way to verify the instrumentation accuracy is with an independent calibrated temperature sensor and display. Place the sensor inside the chamber, near the chamber’s conditioner fan grille. If the readings agree within the specified limits, then no calibration adjustments are necessary. For the F4 Controller: If calibration of the controller is necessary, refer to the “F4 Temperature/Humidity Controller User’s Manual”. For the F4T Controller: If calibration of the controller is necessary, refer to the “F4T Touch Screen Controller User’s Guide”.



How to Verify the Humidity Calibration TestEquity recommends verifying the humidity calibration before attempting to actually perform a calibration. If you try to calibrate the instrumentation before determining that calibration is necessary, you may make it worse if done incorrectly. A Vaisala HMM100 capacitive-type sensor is used to measure humidity. The HMM100 output is configured for 0-100%RH = 0-20 mA. The HMM100 sensor specifications are: Sensor accuracy at –20°C to +40°C* Sensor accuracy at –40°C to –20°C, +40°C to +175°C* ±2%RH (0 to 90 %RH ±3%RH (90 to 100%RH)

±2.5%RH (0 to 90 %RH ±3.5%RH (90 to 100%RH)

*Note: Chamber controlled humidity range is 10°C to 85°C The easiest way to verify the instrumentation accuracy is with an independent calibrated humidity sensor and display. Place the sensor near the chamber’s humidity sensor, which is located towards the right side of the conditioner fan grille. If the readings on the F4/F4T Controller agree within the specified limits above, then no calibration adjustments are necessary. TestEquity recommends the Vaisala HM70 Handheld Humidity/Temperature Meter with the HMP77B Probe for verifying the humidity sensor calibration at all humidity conditions that the chamber is capable of achieving. For the F4 Controller: If calibration of the controller is necessary, refer to the “F4 Temperature/Humidity Controller User’s Manual”. For the F4T Controller: If calibration of the controller is necessary, refer to the “F4T Touch Screen Controller User’s Guide”. Humidity Sensor Calibration and Maintenance TestEquity recommends the Vaisala HM70 Handheld Humidity/Temperature Meter with the HMP77B Probe for calibrating the humidity sensor at all humidity conditions that the chamber is capable of achieving. Alternatively, the humidity sensor can be calibration with Vaisala HMK15 Humidity Calibrator which uses saturated salt solutions. These items are available from Vaisala Inc. (www.vaisala.com). The Vaisala HMM100 sensor is calibrated per the procedure in the Vaisala HMM100 User’s Guide, which can be downloaded from www.testequity.com/manuals. The humidity sensor element (Vaisala HUMIKAP 180R) is replaceable. The end of the sensor probe has a stainless steel sintered filter (Vaisala HM47280SP), which can be removed by unscrewing it. Handle the sensor by its outer plastic support. DO NOT TOUCH THE SENSOR PLATE. The sensor and sintered filter can be cleaned with distilled water. Do not use any mechanical methods. If you are unable to calibrate the sensor, first try cleaning the sensor element and filter. If this does not help, then replace the sensor.



Theory of Operation Overview Refer to the electrical and refrigeration drawings to identify the referenced items described below. The electrical items are referenced with a letter(s) and number. The refrigeration items are referenced with a number only or number followed by a single letter. Air Heating System The chamber is heated by an open-element nichrome heater (HT1). The heater is located in the air plenum. The F4/F4T Controller provides a time-proportioned output to solid state relay SSR1. This turns the heater ON/OFF as required to maintain the temperature set point. Pilot light PL1 provides an indication on the front panel when the heater is on. A fusible heat limiter (HL) provides failsafe protection against a catastrophic failure by opening the heater circuit at +240°C. Humidity System Water is heated by an immersion-type heater (HT2) to generate vapor. The heater is located in the humidifier tank. The F4/F4T Controller provides a time-proportioned output to a solid state relay (SSR2). This turns the humidifier heater on/off as required to maintain the humidity set point. Pilot light PL4 provides an indication on the front panel when the humidifier heater is on. Water level in the humidifier is maintained by float a float valve assembly which is external to the humidifier tank. The immersion heater has an embedded thermocouple which is connected to Input 3 of the F4/F4T Controller to control an Alarm output. This provides failsafe protection against a heater failure in the event of a low water condition by opening the humidifier heater contactor C4 if the heater reaches +125°C. The alarm will self-reset when the heater reaches +100°C. Refrigeration System The F4/F4T Controller turns the compressor ON based on the demand for cooling. Dry-bulb cooling is accomplished through the cool expansion valve (30) and the finned evaporator coil (15) inside the chamber. The F4/F4T Controller cycles the liquid-line solenoid valve (SV1 or 18/19A) ON/OFF as required to maintain the temperature set point. Pilot Light PL2 provides an indication on the front panel when the F4/F4T Controller is turning SV1 is on. Dehumidification is accomplished through expansion valve (11B) and the finned dehumidify coil inside the chamber. The F4/F4T Controller cycles the dehumidify coil liquid-line solenoid valve (SV2, 18/19D) ON/OFF through SSR3 to control the amount of dehumidification. If the compressor is off because no dry-bulb cooling was required, then TM1 enable the refrigeration system upon demand for dehumidification. The hot gas regulator (9) is adjusted to keep the suction pressure at 2 PSIG when both S1 and SV2 are off. A suction line cooling thermostatic expansion valve (11A) senses the suction line temperature and injects liquid refrigerant to cool the suction return gas within safe limits.



Troubleshooting

SYMPTOM CONDITION CAUSES Does not heat up at all. 1. If F4 controller light 1A is ON

(F4T upper PWR bar is 100%), circulator fan is ON, circulator fan is ON, the Heat light is OFF.

2. If F4/F4T Controller light 1A is

ON, circulator fan is ON, the Heat light is ON.

1. Solid State Relay SSR1 is defective (open).

2. Heat Limiter HL is open. Heater

HT1 is open.

Heats up too slow. 1. Does not meet published specifications.

1. Chamber interior is overloaded. Circulator motor is not turning. Port plug is not in port. Verify that input voltage is within tolerance.

Heat is on all the time. 1. If F4 controller light 1A is OFF (F4T upper PWR bar is 0%).

1. Solid State Relay SSR1 is defective (shorted).

Does not cool at all. 1. If F4 controller light 1B is ON (F4T upper PWR bar is 100%), DigitalOut 8 (F4T Compressor Output) is ON, the Cool light on front panel is OFF, both compressors are OFF.

2. Setpoint is low than chamber temperature but F4 DigitalOut 8 (F4T Compressor Output) is not ON.

3. If the Cool light is ON, compressors are ON.

1. Pressure switch PS1 or PS2 is tripped.

2. Controller is mis-configured.

Re-enter values as documented in the controller manual.

3. Solenoid valve SV1 (or SV3 if

in Humidity mode) may be defective in closed position. Refrigeration leak, plugged capillary tubes.

Pressure switch DPS1 trips. (on rear right side)

1. Trips after operating for a while.

2. Trips immediately after turn on.

1. Ambient temperature may be too high, over 90°F. Dirty condenser, inadequate clearance from back of chamber to wall.

2. Low charge (leak).

Sightglass has bubbles or does not look full.

1. During all running conditions.

2. Only when cool light is cycling.

1. Low charge (leak).

2. No problem. This is normal. Cools too slowly or does not reach –35°C.

1. No bubbles in the sightglass. 1. Chamber interior is overloaded. Test sample is energized, giving off heat. Circulator motor is not turning. Port plug is not in port. Door is not sealing completely. Ice on evaporator.



SYMPTOM CONDITION CAUSES Temperature readout on F4/F4T Controller varies more than ±0.5°C or 1°C total.

1. If tuning PID control parameters in F4/F4T Controller were changed.

2. If tuning PID control parameters in F4/F4T Controller are as shipped from TestEquity.

3. If tuning PID control parameters in F4/F4T Controller are as shipped from TestEquity and only occurs in cool mode.

1. Re-enter values as shipped from TestEquity.

2. Control parameters may need to

be changed for your unique test conditions.

3. Solenoid valve SV1 may be

defective.

Compressors turn on and off too frequently.

1. If compressor control parameters in F4/F4T Controller were changed.

2. If compressor control

parameters in F4/F4T Controller are as shipped from TestEquity.

1. Re-enter values as shipped from TestEquity.

2. Solenoid valve SV1 may be

defective in the open position.



Refrigeration System Charging Instructions ! WARNING: Repair of the refrigeration system must be performed only by a properly

trained mechanic who is experienced in repairing cascade refrigeration systems. Do NOT substitute any component. Do NOT substitute refrigerants. Improper repairs will void the warranty.

These instructions are intended as guidelines for repairing TestEquity chambers. Details such as how to attach a gauge manifold are not covered. These are NOT do-it-yourself instructions! Refrigerant Charge TestEquity does NOT recommend charging the system by relying on a clear sight glass only. Although a clear sight glass generally means the system is fully charged, it can be misleading. For example, if the system is charged on a cool day or with an empty chamber, it could be undercharged for hot days or with a heavy load. The proper charging procedure is as follows: 1. Repair any leaks before recharging. 2. Attach a vacuum pump and manifold gauge to the suction and discharge ports. 3. Evacuate the system to at least 100 microns. DO NOT GUESS! You must use a micron

gauge. 4. Use a charging scale to weigh in 14 ounces of R-404A. 5. Verify the cooling performance as outlined in “How to verify the chamber performance”. NOTE: If the F4/F4T Controller is cycling (Cool Light cycles on/off), the sightglass may appear 1/2 to 2/3 full. This is normal.



Recommended Spare Parts Replacement parts are available from TestEquity. Parts are generally in-stock and ready for immediate shipment. Next-day delivery is always available. If you cannot risk being out of service for even one day, then you should purchase critical spare parts in advance. Although most parts are standard and available from a variety of local distributors, some parts are either harder to find or custom. The following is a list of the kinds of parts that you may want to purchase in advance. Electrical Parts Contactors Relays Fuses Heat Limiter Circulator Motor and Fan Switches Refrigeration Parts Solenoid Valves Expansion Valves Regulator Valves



Major Electrical Parts Description Mfr Mfr Part No. Ref # Part # Qty UOM Line Cord Intl. Config. 80560 200205 1 ea Audible Alarm Floyd Bell MC-09-201-Q AL1 200005 1 ea Arc Suppressor ITW Paktron 104MACQRL150 AS1-9 200296 9 ea Contactor, 1 Pole, 30A, 120V Coil Hartland Controls HCC-1XT02AA C1-4 200237 3 ea Relay, Octal DPDT 10A 120VAC Idec RR2P-UCAC120 CR1, CR3 200292 2 ea Circulator Motor Kit CUSTOM CUSTOM FM2 100585 1 ea Heat Limiter Thermodisc G5A01240C HL 200070 1 ea Air Heater CUSTOM 200277 HT1 200277 1 ea Humidifier Heater CUSTOM 222395 HT2 222395 1 ea Lamp Philips T22, 125-130V, 15W, E14 LT1 200203 1 ea Pilot Light Chicago Miniature 6063-001-534R PL1-4 222280 4 ea Resistor, 1 kohm, 25W Vishay / Dale RH0251K000FE02 R1 200295 1 ea Humidity Sensor Vaisala HMM100 RHS 200320 1 ea Relay, Solid State, 10A, 24VDC In Omron G3NE-210T-US DC24 SSR1-3 200177 3 ea Relay, Solid State, 10A, 5VDC in Omron G3NE-210T-US DC5 SSR4-7 200129 4 ea Relay, Solid State 5A Omron G3NA-205B-DC5-24 SSR9-12 200032 3 ea Switch Carlingswitch LRA211-RA-B/125N SW1, 3 200023 2 ea Switch, ON-OFF-ON Carlingswitch RC911-RA-B-0-N-XLR1 SW2 200275 1 ea F4 Temp/Humidity Controller Watlow F4/F4TDH-CKCC-01AC TCR1 200084 1 ea F4T Temp/Humidity Controller Watlow F4T1L2EAA2F2018 TCR1 222511 1 ea Limit Controller Watlow PM6L1AJ-AAAABAB TCR2 200301 1 ea Timing Module, Off Delay Airotronics TH3ML1300SC TM2 280200 1 ea Transformer, 20VAC Hammond 166D20 TR1 200087 1 ea Chart Recorder Option Recorder, 2 Pen, 10" Honeywell DR4302-0000-G0100 RCD1 200098 1 ea Paper, -90 to 210 C, 0 to 100 Graphic Controls 32002974 (Custom) 200155 1 ea Pen, Purple, Six Pack Honeywell 30735489-007 200097 1 ea Pen, Red, Six Pack Honeywell 30735489-002 200099 1 ea



Major Refrigeration Parts Description Mfr Mfr Part No. Ref # Part # Qty UOM Accumulator CUSTOM 100345 27 100345 1 ea Capillary Tube, Equalizer, 0.031 J/B Industries TC31 28 100320 120 in Condensing Unit, 1/2 HP Tecumseh AE2425Z-AA3CDG 5 383230 1 ea Dehumidifiy Coil CUSTOM 180450 17 180450 1 ea Expansion Valve Danfoss 068U2317 (uses 068U1033 Orifice) 30 100471 1 ea Expansion Valve Danfoss 068U202700 11A, B 100314 2 ea Filter Drier Danfoss 023Z5048 6 100524 1 ea High Pressure Cutout Johnson Controls P20DB-1D 8 100341 1 ea Hot Gas Bypass Regulator Sporlan ADRI-1/4-0/55 9 100497 1 ea Evaporator CUSTOM 100504 15 100504 1 ea Orifice for 100471 Danfoss 068U1033 (goes into 068U2317) p/o 30 100607 1 ea Sight Glass Henry MI-30-1/4S 7 100608 1 ea Solenoid Coil Sporlan MKC-1-120/50-60 SV1, 2 100011 2 ea Solenoid Valve Sporlan E3S130, 3/8 X 3/8ODF 19A, B 100010 2 ea Strainer Supco S211 29 100606 1 ea General Parts Description Mfr Mfr Part No. Ref # Part # Qty UOM Door Gasket CUSTOM CUSTOM 380031 1 ea Door Latch, Chamber Workspace Southco A7-10-301-20 300216 1 ea Port Plug, Foam, 4" CUSTOM CUSTOM 300534 2 ea Shelf with 4 Clips CUSTOM CUSTOM TE-0231 1 ea Shelf Retainer Clip Kason Style 66, #0066000008 300015 4 ea Window, Heated CUSTOM CUSTOM 300709 1 ea



EZ-Zone Limit Controller Setup Parameters ! CAUTION: The EZ-Zone Limit Controller has been properly configured by TestEquity to

match the chamber’s system requirements. Improper modifications to these setup values can result in erratic performance and unreliable operation. Do not attempt to modify the setup values, unless you thoroughly understand what you are doing. If there is any doubt, please call TestEquity before proceeding.

Setup Menu Prompt Function Setting Alternate Setting [~LoC] Lockout Menu [~~`2] See NOTE 1 below [~SEn] Sensor Type [`~tC] Do Not Change [~Lin] Linearization [~`~t] Do Not Change [~dEC] Decimal [```0] Alt. “0.0” [~C_F] °C or °F [```C] Alt. “F” [`r;Lo] Range Low [`-42] Do not make any lower [~r;hi] Range High [`180] Do not make any higher [~Fn2] Output 2 Function [LiM] Do Not Change [`L;Sd] Limit Sides [both] Alt. “high” (High only) or “LoW” (Low only) [~L;hY] Limit Hysteresis [~~`2] Change not recommended [`A;ty] Alarm Type [~oFF] Do Not Change [PAr1] Upper Display [ACPu] Alt. “none” [PAr2] Lower Display [~Lst] Alt. “Lh.s” (High Set Point) or “LL.S” (Low Set Point) [`ad;s] Zone Address [~~`1] Not functional for this application NOTE 1: The Lockout Menu [~LoC] sets the security clearance level as follows: [~~`1] Operations Menu, read only [~~`2] Operations Menu, set point read/write [~~`3] Operations Menu, set point read or write (same as level 2) [~~`4] Operations Menu, full access read/write (required to access Calibration Offset below) [~~`5] Operations Menu and Setup Menu full access (required to access Setup Menu and Calibration Offset below) Operations Menu Prompt Function Setting Alternate Setting [~LLs] Low Set Point [~-42] Appropriate Low Limit Set Point [~Lhs] High Set Point [~180] Appropriate High Limit Set Point [~iCA] Calibration Offset [~~~0] Calibration Offset as required (see NOTE 2 below) NOTE 2: LoC parameter in Setup Menu must be set for 4 or 5 to access the Calibration Offset parameter.

Chapter 8 – Warranty


Chapter 8 - Warranty

TestEquity LLC Limited Warranty TestEquity LLC (TestEquity) warrants Environmental Chambers (Equipment) manufactured by TestEquity and supplied under this contract to be free from defects in materials and workmanship under normal use and proper maintenance. TestEquity will repair or replace any defective part for a period of THREE YEARS from the date of invoice. TestEquity reserves the right to require any defective part be returned, freight prepaid, to TestEquity’s factory or to inspect any defective part at the Purchaser’s site. TestEquity shall have sole discretion to determine whether any part is defective and whether any defective part will be repaired or replaced. This limited warranty shall extend to any standard chamber accessory and component part which is normally sold by TestEquity. Non-standard accessories and component parts specified by the Purchaser shall be warranted only to the extent of the original manufacturer’s warranty, if any exists. If the repair or replacement is performed in the FIRST YEAR from the date of invoice, TestEquity will also pay for the labor associated with the repair at the Purchaser’s site, subject to TestEquity’s prior approval. During the SECOND and THIRD YEAR of the warranty period, Purchaser will be responsible for the installation and cost of installation of replacement or repaired parts, and the cost of refrigerant. Purchaser shall notify TestEquity in writing of any alleged defect within 10 days after its discovery within the warranty period. TestEquity reserves the right to satisfy the labor portion of this limited warranty either through its own service personnel or an authorized agent. In order to provide expeditious service, TestEquity reserves the right to satisfy its limited warranty obligation by sending replacement parts to be installed by the Purchaser if they can be installed easily without special tools or training. TestEquity reserves the right to satisfy this limited warranty by requiring the Purchaser to return the Equipment to TestEquity when such return is feasible. The following parts are excluded from this limited warranty and are sold as-is or are considered expendable: interior light bulb, viewing window, paint and cosmetic surface finishes and treatments, port plugs, refrigerant. This limited warranty shall extend in full to Equipment installed within continental United States and Canada. For all other locations, Purchaser is responsible for all labor costs for repairs or parts installation, and for all shipping costs associated with providing replacement parts. This limited warranty does not cover: (1) Defects or damages arising as the result of shipment by common carriers or private transportation, unless TestEquity undertakes shipment and transportation of the Equipment to Purchaser’s site or contractually assumes the risk of damage to the Equipment in shipment; (2) Defects or damages arising out of, or as the result, of mishandling, modification, or improper start up, installation or maintenance of the Equipment (including start up, installation or maintenance not in accordance with TestEquity’s written procedures); (3) Defects or damages resulting from, or arising out of, abuse, misuse, neglect, intentional damage, accident, fire, flood, earthquake, or any other act of God. This warranty as to Equipment is LIMITED to repair or replacement of parts or Equipment in the determination of TestEquity LLC THE FORGOING LIMITED WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES INCLUDING THE IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE AND MERCHANTABILITY. TestEquity LLC DISCLAIMS ANY LIABILITY FOR ANY DAMAGES RESULTING FROM DELAY OR LOSS OF USE IN SERVICE OR REPAIR, OR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THE EQUIPMENT, EXCEPT AS STATED IN THIS PARAGRAPH. This limited warranty cannot be modified in any way except in writing by both TestEquity and Purchaser. Invalidation of any one or more of the provisions of this limited warranty shall in no way affect any of the other provisions hereof, which remain in full force and effect. This limited warranty shall be extended only to the first Purchaser of this Equipment and is not transferable.

Chapter 9 – Drawings


Chapter 9 – Drawings

Electrical Subpanel Component Location

Purge Subpanel (optional) Main Subpanel

model 123h temperature/humidity chamber operation and ......testequity 123hs temperature/humidity...

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